WO2023175836A1

WO2023175836A1 - Method for constructing foundation of structure

Info

Publication number: WO2023175836A1
Application number: PCT/JP2022/012294
Authority: WO
Inventors: 芳行高野; 忠程原
Original assignee: 日揮グローバル株式会社
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2023-09-21

Abstract

This method for constructing a foundation of a structure having a footing and a pedestal includes: a mold forming step for using a 3D printer to form, from concrete or mortar, a mold to serve as an integral mold of the footing and the pedestal; and a filling step for filling concrete into the mold, wherein the mold has a shape, the horizontal cross-sectional area of which decreases from the footing side toward the pedestal side.

Description

Method of constructing the foundation of a structure

The present invention relates to a method of constructing a foundation for a structure.

It is necessary to construct various structures at sites such as resource development and plant construction. The construction of buildings and other structures requires a large initial investment and a long construction period, which has a significant impact on the overall development. In addition, structures may be constructed in mountainous areas, wilderness areas, etc. far from urban areas, and transportation of workers and supplies is costly and time-consuming, and it may not be easy to secure skilled workers. For this reason, improvements such as shortening the construction period, saving labor, and stabilizing quality are required.

For example, Patent Document 1 describes a construction method in which a mortar frame is formed by extruding concrete from an additive manufacturing device around reinforcing bars, and a concrete core is further formed inside the mortar frame.

Japanese Patent Application Publication No. 2020-111941

According to the proposal in Patent Document 1, when constructing reinforced concrete structures such as bridge piers, by using fiber-filled mortar frames as formwork, earthquake resistance can be maintained even if the formwork is integrated with the concrete core without being dismantled. It has been suggested that recovery performance is improved. However, no particular proposals or suggestions have been made regarding the foundations of structures.

An object of the present invention is to provide a method for constructing the foundation of a structure that can shorten the construction period, save labor, and improve quality stability when constructing the foundation of the structure.

A first aspect of the present invention is a method for constructing a foundation for a structure having a footing and a pedestal, wherein a formwork that becomes an integrated formwork for the footing and the pedestal is formed from concrete or mortar using a 3D printer. and a filling step of filling the inside of the formwork with concrete, and the formwork has a shape in which a horizontal cross-sectional area decreases from the footing side to the pedestal side. This is a method of constructing the foundation of a structure characterized by:

A second aspect of the present invention is characterized in that in the first aspect, the concrete is filled using a 3D printer in the filling step.

A third aspect of the present invention, in the first or second aspect, includes a reinforcing bar placement step of arranging reinforcing bars for the footing and the pedestal prior to the form forming step, and in the filling step, the reinforcing bars for the footing and the pedestal are arranged. The method is characterized in that the reinforcing bars are embedded in the concrete filled inside the formwork.

A fourth aspect of the present invention is a connecting device according to any one of the first to third aspects, which allows structures placed above the pedestal to be connected by anchor bolts or welding prior to the filling step. A member is installed, and in the filling step, a part of the joining member is embedded in concrete filled inside the formwork.

A fifth aspect of the present invention is a formwork embedding step according to any one of the first to fourth aspects, in which a embedding material is poured around the formwork and at least a part of the formwork is buried in the embedding material. It is characterized by having the following.

A sixth aspect of the present invention is characterized in that in the formwork embedding step in the fifth aspect, the embedding material is poured using a 3D printer.

A seventh aspect of the present invention, in the fifth or sixth aspect, includes an outer frame forming step of forming an outer frame around the mold using a 3D printer, and in the mold embedding step, the The method is characterized in that the embedding material is poured into the inside of the outer frame.

According to the first aspect, since the footing and the pedestal can be formed in an integrated process, improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved when constructing the foundation of the structure.

According to the second aspect, by using a 3D printer to fill the formwork, it is possible to further improve the construction period, save labor, and stabilize quality.

According to the third aspect, the foundation can be reinforced by arranging reinforcing bars for the footing and pedestal and embedding them in concrete.

According to the fourth aspect, by installing a joining member that can join structures placed above the pedestal and embedding a part of the joining member in concrete, the joining member is more securely fixed. can do.

According to the fifth aspect, by burying at least a portion of the formwork in the embedding material, it is possible to construct a foundation that can stably support a structure.

According to the sixth aspect, by using a 3D printer for embedding the formwork, further improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved.

According to the seventh aspect, by using a 3D printer to form the outer frame, further improvements such as shorter construction period, labor saving, and stable quality can be achieved.

It is an explanatory view showing an example of a reinforcement arrangement process. It is an explanatory view showing an example of a formwork formation process. It is an explanatory view showing an example of an installation process of a joining member. It is an explanatory view showing an example of a filling process. It is an explanatory view showing an example in which a joining member is fixed to a reinforcing bar. It is an explanatory view showing an example of a basic structure. It is an explanatory view showing an example of an outer frame formation process. It is an explanatory view showing an example of a formwork embedding process. It is an explanatory view showing an example of a paving process.

The present invention will be described below based on preferred embodiments.

<Foundation structure with footing and pedestal>
The basic structure 15 shown in FIG. 6 has a shape in which a footing 15a and a pedestal 15b are integrated. This basic structure 15 can be constructed through a step of arranging the reinforcing bars 11 shown in FIG. 1, a step of forming the formwork 12 shown in FIG. 2, and a step of filling the filler 14 shown in FIG. 4. Although not particularly shown, an upper structure (not shown) is constructed above the pedestal 15b.

The foundation structure 15 becomes the foundation of the superstructure. The superstructure may be various structures or buildings. Examples include, but are not limited to, workplaces, offices, factories, warehouses, storage facilities, lodgings, passageways, and the like. The structure of the superstructure is not particularly limited, and may be a building with walls or pillars, or may be a site capable of supporting loads such as people, luggage, materials, etc. The structural material of the superstructure is not particularly limited, but examples include reinforced concrete construction, steel frame construction, reinforced steel concrete construction, wooden construction, stone construction, and brick construction.

The ground 20 at the height at which the foundation structure 15 is installed is preferably leveled by excavating the ground at the planned construction site before starting the construction process of the foundation structure 15. Ground improvement such as dewatering and compaction may be performed as necessary.

It is preferable to pour concrete onto the surface of the ground 20 to form a reference surface. In order to specify the position on the ground 20 where the foundation structure 15 etc. are placed, it is preferable to display various reference lines, symbols, etc.

It is preferable that reinforcing bars 11 be placed inside the foundation structure 15. By integrating the reinforcing bars 11 with the concrete of the filler 14, the foundation structure 15 can have a reinforced concrete structure.

The reinforcing bar 11 shown in FIG. 1 has a footing portion 11a disposed close to the ground 20, and a pedestal portion 11b protruding upward from the center of the footing portion 11a. The footing part 11a is a reinforcing bar for the footing 15a, and the pedestal part 11b is a reinforcing bar for the pedestal 15b. Although not particularly illustrated, the pedestal portion 11b may be located eccentrically from the center of the footing portion 11a.

Although the shape and structure of the reinforcing bar 11 are not particularly limited, it generally means a bar-shaped steel material. Instead of the reinforcing bars 11 or in combination with the reinforcing bars 11, steel members such as frame-shaped, plate-shaped, column-shaped, net-shaped, and lattice-shaped may be used. Alternatively, a structure similar to the reinforcing bars 11 may be formed by a combination of two or more of these. The shape of the horizontal cross section of the footing portion 11a is not particularly limited, but may be circular, quadrangular, polygonal, or the like.

It is preferable that the pedestal portion 11b remains perpendicular to the ground 20. In order to reinforce the pedestal portion 11b when fixing the joining member 13, the reinforcing bar 11 may have a reinforcing material 11c. Thereby, even if the reinforcing bars 11 are made of a simple structure or material, the pedestal portion 11b can be stably supported on the footing portion 11a. The reinforcing member 11c may be inclined so as to connect the peripheral edge of the footing portion 11a and the upper portion of the pedestal portion 11b. A plurality of reinforcing members 11c may be arranged evenly or at predetermined intervals around the pedestal portion 11b.

The footing 15a has a wider horizontal cross-sectional area than the pedestal 15b. Since the footing 15a contacts the ground 20 over a wider area, the load of the structure can be effectively transmitted to the ground and stability can be achieved. It is preferable that the shape of the footing 15a in contact with the ground 20 is uniform. For example, it is preferable to fill the space between the footing portion 11a and the ground 20 with the filler 14 in the filling process described below. Thereby, the footing 15a can be brought into close contact with the ground 20.

Although not particularly illustrated, in order to maintain a gap between the footing 11a of the reinforcing bar 11 and the ground 20, a spacer made of mortar, wood, stone, etc. may be partially placed under the footing 11a. Thereby, the filler 14 can be easily filled between the footing portion 11a of the reinforcing bar 11 and the ground 20.

The formwork 12 of the embodiment is an integrated formwork of a footing 15a and a pedestal 15b. Specifically, the formwork 12 includes a footing formwork 12a that serves as a formwork for the footing 15a, and a pedestal formwork 12b that serves as a formwork for the pedestal 15b.

In the forming process of the formwork 12, as shown in FIG. 2, the footing formwork 12a and the pedestal formwork 12b are integrally formed using the 3D printer 21. The material for forming the formwork 12 is concrete or mortar. Further, the core portion of the foundation structure 15 is formed by filling the formwork 12 with a filler 14 such as concrete, as shown in FIG.

Conventional foundation structures with footings and pedestals often have an inverted T-shape, similar to the reinforcing bars 11 used in the embodiment. When forming an inverted T-shaped structure using concrete using conventional technology, there are (a) a step of forming a footing formwork, (b) a step of filling the footing formwork with concrete to form a footing, and (c) a step of forming a footing. The process of forming a pedestal formwork on the footing and (d) filling the pedestal formwork with concrete to form the pedestal had to be performed in order, making it difficult to shorten the construction period.

In the basic structure 15 of the embodiment, the footing 15a and the pedestal 15b are integrally formed using the form 12 in which the footing form 12a and the pedestal form 12b are integrally formed. This allows the construction period to be significantly shortened. Further, since the filler 14 forming the footing 15a and the filler 14 forming the pedestal 15b are cured integrally, poor bonding between the footing 15a and the pedestal 15b is less likely to occur.

The construction method of the embodiment includes (1-1) a formwork forming step of forming the footing formwork 12a and the pedestal formwork 12b in one step; (1-2) filling the inside of the formwork 12 with a filler 14; A filling process may be performed to form footing 15a and pedestal 15b.

Further, (2-1) a step of forming the footing formwork 12a on the ground 20, (2-2) a step of forming the pedestal formwork 12b on the footing formwork 12a, (2-3) a step of forming the formwork 12 The step of filling the inside of the footing 15a with the filler 14 to form the footing 15a and the pedestal 15b may be carried out in sequence.

The 3D printer 21 can form a tall structure by forming the discharged material into a layer having a certain thickness and sequentially stacking the layers. The process of discharging the material from the 3D printer 21 may be performed continuously from the lower part of the footing formwork 12a to the upper part of the pedestal formwork 12b, but this is not limited to this case, and the process of discharging the material from the 3D printer 21 may be performed continuously during the process of forming the formwork 12. There may be an intervening period of interruption.

If the work is interrupted during the process of forming the formwork 12, it is preferable to cure the material and take measures to suppress drying shrinkage. For example, if the work is interrupted while the lower part of the formwork 12 is being discharged from the 3D printer 21, a concrete curing agent may be applied or a setting retarder may be sprayed. When the remaining material is discharged after the material forming part of the formwork 12 is cured, the surface of the cured material may be subjected to chipping treatment, high-pressure water washing, adhesive application, etc.

The formwork 12 of the embodiment has a shape in which the horizontal cross-sectional area decreases from the footing 15a side to the pedestal 15b side. Thereby, when the footing formwork 12a and the pedestal formwork 12b are integrally formed, the difference between the shape of the footing 15a and the shape of the pedestal 15b can be reduced. For example, it is preferable that the pedestal formwork 12b has a tapered shape such as a conical shape or a pyramidal shape.

The footing formwork 12a in the illustrated example is formed perpendicular to the ground 20. Although not particularly illustrated, the footing formwork 12a may have a portion inclined with respect to the ground 20. Moreover, the illustrated pedestal formwork 12b has a shape that is inclined with respect to the ground 20, except for the upper part. A portion of the pedestal formwork 12b may have a portion perpendicular to the ground 20. Further, the entire pedestal formwork 12b from the lower part to the upper part may have a shape inclined with respect to the ground 20.

By using the formwork 12 in which the footing formwork 12a and the pedestal formwork 12b are integrally formed, the footing 15a and the pedestal 15b can be formed in an integrated process. It is possible to achieve improvements such as shortening of time, saving labor, and stabilizing quality.

Furthermore, since the upper part of the formwork 12 has a small horizontal cross-sectional area, the reinforcing bars 11 are installed on the ground 20 prior to the forming process of the formwork 12, as described above. A formwork 12 may be formed around the reinforcing bars 11 using a 3D printer 21. In this case, the reinforcing bars 11 are surrounded by the formwork 12 except for a part of the pedestal portion 11b. Thereby, a pedestal formwork 12b having a smaller horizontal cross-sectional area than the footing portion 11a of the reinforcing bar 11 can be formed.

Although not particularly illustrated, it is also possible to install the formwork 12 on the ground 20 by transporting the formwork 12 formed using the 3D printer 21 at another location to the surroundings of the reinforcing bars 11.

As shown in FIG. 4, in the process of filling the filler 14, by using concrete as the filler 14 and embedding the reinforcing bars of the reinforcing bars 11, the reinforcing bars of the footing 15a and the reinforcing bars of the pedestal 15b can be arranged integrally. . Since the foundation structure 15 is formed from reinforced concrete, the foundation structure 15 can be reinforced.

As concrete, a mixture of cement, water, fine aggregate, coarse aggregate, etc. is used. As the mortar, a mixture of cement, water, fine aggregate, etc. is used. Desired admixtures may be added to concrete or mortar as needed. Examples of the fine aggregate include sand, crushed sand, and the like. Examples of the coarse aggregate include gravel and crushed stone. Slag, recycled aggregate, etc. may be used as the aggregate. These are classified as fine aggregates or coarse aggregates depending on their particle size.

The material for the formwork 12 may be either concrete or mortar. When forming the formwork 12 using the 3D printer 21, concrete or mortar is discharged in an uncured state.

Since the formwork 12 includes a portion inclined with respect to the ground 20, the material of the formwork 12 in an uncured state after being discharged from the 3D printer 21 preferably has low fluidity. When the vertical direction is 0° and the horizontal direction is 90°, the inclination angle at the portion of the formwork 12 where the horizontal cross-sectional area is reduced should be greater than 0°, but for example, it may be about 10°, about 15°, or about 20°. The angle may be about 25° or about 25°.

Although the method for applying the filler 14 is not particularly limited, the 3D printer 21 may be used to fill the filler 14. By using the 3D printer 21, when filling the filler 14, improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved. As a means other than the 3D printer 21, for example, a concrete pump truck or the like may be used to fill the filler 14. The formation of the mold 12 using the 3D printer 21 and the filling of the filler 14 using other means may proceed simultaneously at different locations.

When filling the filler 14 into the formwork 12 using the 3D printer 21, concrete pump truck, etc., the concrete is discharged in an uncured state. It is preferable that the material of the filler 14 has high fluidity so that the filler 14 is supplied to every corner of the formwork 12 having a shape with a decreasing horizontal cross-sectional area.

In order to eliminate the need for compacting the filler 14 after it is filled inside the formwork 12, it is preferable to use self-compacting concrete (so-called "high fluidity concrete") as the filler 14. As the self-compacting concrete, a material that is blended with an appropriate chemical admixture to have both high fluidity and material separation resistance may be used.

In order to provide a difference in fluidity between the materials of the filler 14 and the formwork 12, differences may be provided in water content, admixture materials, etc. Filler 14 may have a composition similar to that of concrete used when forming forms using conventional methods. Since the material of the formwork 12 has lower fluidity than the filler 14, chemical admixtures, fibers, etc. may be added thereto.

As mentioned above, a superstructure (not shown) can be joined to the base structure 15. For this reason, it is preferable that the joining member 13 used for joining with the superstructure is embedded in the concrete of the filler material 14. Thereby, the foundation structure 15 and the upper structure can be easily joined.

The illustrated basic structure 15 has a joining member 13 above the pedestal 15b. The joining member 13 may be installed after the formwork 12 is formed, as shown in FIG. 3, or may be installed before the formwork 12 is formed, as shown in FIG.

The joining member 13 can be used to join the upper structure by anchor bolts, welding, etc. The joining member 13 may have the function of joining structural members such as steel frames, wood, columns, and outer walls used in the superstructure. When joining the steel frame of the upper structure to the substructure 15, the joining member 13 may be a metal plate or the like that can be welded to the steel frame.

The reinforcing bars 11 may have a function of fixing the joining member 13. As shown in FIG. 3, when installing the joining member 13 after forming the formwork 12, a template 13a is installed between the formwork 12 and the joining member 13, and The positional relationship of the joining members 13 may be fixed.

An identifier may be given to the joining member 13 or the template 13a in order to identify information regarding joining of the upper structure, etc. Examples of the identifier include a tag plate and RFID (Radio Frequency Identification). The identifier may be data recognized through wireless communication, a code such as a bar code or two-dimensional code recognized by a machine, or a display such as letters, numbers, symbols, figures, etc. that can be recognized visually.

When using the template 13a to hold the joining member 13, the joining member 13 does not need to be fixed to the reinforcing bars 11. Although not particularly illustrated, as shown in FIG. 6, when the joining member 13 is installed before forming the formwork 12, the template 13a can also be installed between the reinforcing bar 11 and the joining member 13.

When installing the template 13a, it is preferable that the template 13a holds the position of the joining member 13 until a part of the joining member 13 is embedded in the filler 14. Although illustration of the template 13a is omitted in FIG. 4, it is preferable to maintain the state in which the template 13a is attached to the joining member 13 until the filler 14 hardens.

It is preferable that the template 13a is removed from the formwork 12 after the filler 14 has hardened. As a result, even if the template 13a having a simple structure with low strength is adopted, the influence of the template 13a on the structure can be ignored and the design can be facilitated. Considering the removal of the template 13a, it is preferable to install the template 13a above the joining member 13 so that the template 13a is not embedded in the filler 14.

The material of the template 13a is not particularly limited, and one or more of reinforcing steel, wood, resin, concrete, stone, brick, etc. can be used. When the template 13a is made of resin, the template 13a may be molded using a 3D printer for resin (not shown).

When fixing the template 13a to the formwork 12, the joining member 13 may be held so as not to come into contact with the reinforcing bars 11. Thereby, even if there is an error in the dimensions, shape, etc. of the reinforcing bars 11, the joining member 13 is positioned relative to the formwork 12 via the template 13a. When increasing the bonding strength between the joining member 13 and the reinforcing bars 11, the joining member 13 may be fixed to the reinforcing bars 11 using a device, adhesive, or the like.

A portion of the joining member 13 necessary for fixing to the joining member 13 is embedded in the filler 14. The joint portion of the joining member 13 with the upper structure is projected above the filler 14 . Although not particularly illustrated, the joining member 13 only needs to be exposed upward, and does not need to protrude above the filler 14 or from the upper end of the formwork 12. The plate of the joining member 13 may be embedded after welding and joining.

The anchor bolts used in the joining member 13 are preferably integrated with the concrete while being embedded in the uncured concrete supplied as the filler 14. Although not particularly shown, it is also possible to use post-installation type anchor bolts. In this case, the anchor bolt is installed after the filler 14 has hardened.

When forming the formwork 12 using the 3D printer 21, design data indicating the shape of the formwork 12 is prepared in advance. The 3D printer 21 discharges material at a predetermined position according to design data to form a structure. When a plurality of foundation structures 15 are constructed with the same design, the formwork 12 can be repeatedly formed using the same design data.

To facilitate management of the ejection position of the 3D printer 21, the 3D printer 21 may be supported by a support such as a gantry 22, as shown in FIG. The gantry 22 is guided by rails extending in a predetermined direction, and can guide the ejection position of the 3D printer 21 to a desired position within the range of the rails. Although not particularly illustrated, the 3D printer 21 may be operated using a robot arm, a crane, or the like.

<Formation of outer frame and burying of formwork>
To bury the foundation structure 15 formed using the formwork 12, as shown in FIG. 7, after forming the outer frame 23 around the formwork 12, as shown in FIG. The embedding material 24 may be poured inside using the 3D printer 21. Since there is no need to remove the formwork 12, improvements such as shortening of construction period, labor saving, and stable quality can be achieved. In addition, when pouring the burial material 24 to the range of the step or slope formed when the ground 20 is dug, the formation of the outer frame 23 may be omitted.

The material, construction method, etc. of the outer frame 23 are not particularly limited, but the outer frame 23 may be formed using the 3D printer 21. By using the 3D printer 21, when forming the outer frame 23, improvements such as shortening of construction period, labor saving, and stable quality can be achieved. The material for the outer frame 23 is not particularly limited, and examples thereof include concrete, mortar, and the like.

It is preferable that the outer frame 23 has a wall-like structure formed so as to prevent the buried material 24 from flowing out. In order to reinforce the outer frame 23, a buttress wall may be installed on the side surface of the outer frame 23, and a cantilever type bottom plate or the like may be installed at the lower part of the outer frame 23.

The relationship between the time of forming the outer frame 23 and the time of construction of the foundation structure 15 is not particularly limited. It may be done either after filling the inside with the filler 14 or after the filler 14 has hardened and the substructure 15 has been completed.

It is preferable that the foundation structure 15 is installed on the ground 20 located underground by digging. Furthermore, in order for the upper structure to be stably supported by the substructure 15, it is preferable to bury at least a portion of the substructure 15 in the embedding material 24.

The buried material 24 includes, but is not particularly limited to, concrete, mortar, soil, sand, and the like. You may use a mixture of two or more types of embedding materials 24. Earth and sand generated by excavating the ground 20 before construction may be used for at least a portion of the buried material 24.

Although the method for constructing the buried material 24 is not particularly limited, the buried material 24 may be poured using the 3D printer 21. By using the 3D printer 21, when burying the substructure 15, improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved. As a means other than the 3D printer 21, for example, a concrete pump truck or the like may be used to pour the buried material 24.

The filling material 24 may be poured after the filling material 14 has hardened and the foundation structure 15 has been completed. After the formwork 12 has hardened, it is possible to pour the embedding material 24 around the formwork 12 even before filling the inside of the formwork 12 with the filler material 14. By bringing forward the construction of the outer frame 23 and the buried material 24 before the completion of the foundation structure 15, the construction period can be further shortened.

The outer frame 23 and the buried material 24 may be placed at necessary locations around the formwork 12, and do not need to be placed over the entire area where the superstructure is constructed. For example, the outer frame 23 and the buried material 24 may not be placed at locations where piping, cables, etc. are to be placed, and space may be secured underground.

The depth to which the buried material 24 is poured inside the outer frame 23 may be equal to the height of the outer frame 23. Further, pouring of the buried material 24 may be finished at a position lower than the height of the outer frame 23.

As shown in FIG. 9, paving material 25 may be laid on top of the buried material 24. The paving material 25 may be made by discharging a fluid material such as concrete or mortar from the 3D printer 21 . As a result, when laying the paving material 25, improvements such as shortening the construction period, saving labor, and stabilizing quality can be achieved. The paving material 25 may have a slope in an appropriate direction to improve drainage.

In FIG. 9, illustration of the outer frame 23 is omitted, and an example is shown in which the paving material 25 is laid inside the foundation structure 15. Although not particularly illustrated, the paving material 25 may be laid until it reaches the outer frame 23.

Although not particularly shown, it is also possible to pave the buried material 24 using concrete, asphalt, tiles, bricks, etc. A construction method different from that of the 3D printer 21 may be used for these pavements.

Although the present invention has been described above based on preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention. Modifications include additions, substitutions, omissions, and other changes to components in each embodiment.

The use of the foundation structure constructed according to the present invention is not particularly limited, but it can be applied to various structures and buildings at sites such as resource development and plant construction.

DESCRIPTION OF SYMBOLS 11... Rebar, 11a... Footing part, 11b... Pedestal part, 11c... Reinforcement material, 12... Formwork, 12a... Footing formwork, 12b... Pedestal formwork, 13... Joining member, 13a... Template, 14... Filling material , 15... Foundation structure, 15a... Footing, 15b... Pedestal, 20... Ground, 21... 3D printer, 22... Gantry, 23... Outer frame, 24... Buried material, 25... Paving material.

Claims

A method of constructing a foundation for a structure having a footing and a pedestal, the method comprising:
a formwork forming step of forming a formwork that becomes an integrated formwork for the footing and the pedestal from concrete or mortar using a 3D printer;
a filling step of filling the inside of the formwork with concrete;
has
A method of constructing a foundation for a structure, wherein the formwork has a shape in which a horizontal cross-sectional area decreases from the footing side to the pedestal side.
The method for constructing a foundation for a structure according to claim 1, wherein in the filling step, the concrete is filled using a 3D printer.
Prior to the formwork forming step, a reinforcing bar placement step of arranging reinforcing bars for the footing and the pedestal,
3. The method of constructing a foundation for a structure according to claim 1, wherein in the filling step, the reinforcing bars are embedded in concrete filled into the formwork.
Prior to the filling step, a joining member is installed that allows structures placed above the pedestal to be joined by anchor bolts or welding,
The method for constructing a foundation for a structure according to any one of claims 1 to 3, wherein in the filling step, a part of the joining member is embedded in the concrete filled inside the formwork. .
The structure according to any one of claims 1 to 4, further comprising a formwork embedding step of pouring a embedding material around the formwork and embedding at least a part of the formwork in the embedding material. How to build the foundation of something.
The method for constructing a foundation for a structure according to claim 5, wherein in the formwork embedding step, the embedding material is poured using a 3D printer.
an outer frame forming step of forming an outer frame around the formwork using a 3D printer,
7. The method for constructing a foundation for a structure according to claim 5, wherein in the form embedding step, the embedding material is poured inside the outer frame.